and steve harrigan is live for us in cairo. steve, these are the biggest crowds we have seen yet. >>reporter: the largest crowds and the most violent. it has calmed down in the last hour at 10:00 p.m. in egypt but the worst clashes in two weeks of protests here. it wasn't police versus the protester but civilian on civilian, members of the muslim brotherhood who support president morsi and those who want to drive him from office and all the conflict happening outside the presidential palace that began with pushing and sticks and rocks and molotov cocktails and shots fired. showing how bitterly the country is divided. >>trace: what do we know what is behind the violence? >>reporter: the first two weeks, antimorsi protesters met in that sure square and now they are marching on the palace. there has been a lost restraint on of the pro morsi supporters which restrain was broken after the man on the palace where the wall were written on with graffiti. they moved in with sticks, rocks and later gun battles in exactly what followed after that. >>trace: thank you in late evening in cairo.